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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Also do all the online classes and challenges at places like OdinProject and Code Wars.
I can't hammer this enough. Make a splash. Get involved in as many open source projects as humanly possible. Check out CodeTriage for more ideas on what to contribute too.
NOTE:
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Hence, a higher number means a more popular project.